Malicious PDF — malware analysis report

Static analysis result for SHA-256 594b8c5159599623…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 01:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f29cbfd84e1cd3bd856e97fde7093b3e SHA-1: 242e988f0b5d1f08dbdb898b4db13fa6f16c3e3a SHA-256: 594b8c51595996232ed2bcd3cce4920670071db45532a23d716cc78346d6bf43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=ryujin+3.5+head+pdf PDF link annotation
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/9498451568.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/77341240429.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a92cee31---sexidexozewuta.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nikimuje.pdfIn PDF document text
    • http://valeneighbors.com/userimages/guziboxi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a2b714579aa69a37345dcbda1faa5793/nigurole.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/60640014742.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/jodetibukipu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/lh8s0t7h86s4ab858otmsb0ips/bojume.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/1dpae9u1aqnbfu30ic1plplv45/47192899533.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/98194089529.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/bofabubunije.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/50234081191.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/82149377259.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b89a3d180---64525488058.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40457971738.pdfIn PDF document text
    • http://tano-cable.com/d/files/vixolabubidelufedekusujar.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfa0b133f1---rojibozopofobovopituxeze.pdfIn PDF document text
    • https://activepymes.com/pub/file/58182105380.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/48595085361.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/26297211579.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/50052879190.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609687091b607---93879204647.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 10824 bytes
SHA-256: edb311fac7161fe6dfd42f0a0cf7828efa3bbb01523b69d63b12391b30fd138d
font_02_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 17256 bytes
SHA-256: 3c6c58d72d2a58bb912fe8c76c11634f0aea4c151059cc3c82cf0aa741b420fd

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